56 mp fx ?

Started Feb 23, 2013 | Discussions thread
noirdesir Forum Pro • Posts: 13,561
Re: It is a gradual thing, not like a definitive barrier

Grevture wrote:

noirdesir wrote:

Grevture wrote:

and virtually impossible to handhold.

That however is a fairly hard limit. It is my impression that, while very good, stabilisation systems don't fully reach the level of a good tripod. Of course this limit is a function of AOV, 'speed' of the lens and the ambient light level.

If we stay within reasonable levels of FOV (eg, 200 mm FF equiv.), already 12 MP required at least 1/400 s. Staying at base ISO, eg, 200, that is f/11 in bright sunlight. Going to 100 MP, ie, quadrupling in linear terms, we are at f/5.6. And that is in bright sunlight.

But maybe it this just confirms the old saying that one needs a tripod for a technically really good photo.

Look, we can successfully handhold compact cameras with way, way, way higher pixel densities, and with their flimsy weight, they are actually more difficult to handhold then a reasonably heavy DSLR.

I think be both agree that it is not the pixel density but the total number of MP and the AOV. Handholding a compact camera or a FF DSLR for the same AOV and the same MP poses exactly the same challenges (well having a viewfinder or not influences posture).

I just had the chance to try out Canon Powershot SX50 for a couple of weeks, you know the one with the insane 50x zoom range. It is a 4.3-215 mm zoom, which gives image angles corresponding to 24-1200 mm on a FX camera. And with its 12 megapixel 1/2.3 sensor it has a pixel density corresponding to well over 350 megapixel in a FX sized sesnor. And yet, you can shoot with it at 215 mm (corresponding to 1200 mm on FX) hand held. Really. Sure, you do need good light, and it has a good stabilization system. But still it points out that 36 or say 56 megapixels on a FX sensor is not such a big deal many try to make it into.

I agree higher pixel densities puts higher demands on hand holding, but it is a very gradual increase, not a definitive barrier. I would not hesitate for a moment to use a 100 mpix DSLR hand held - unless I am really sloppy it will almost always give me more detail then using a 12 or 24 megapixel camera in the same situation. Of course, if I want to get the full potential of those 100 megapixels, I would put it on a tripod. But that was equally true when I used the D70 almost ten years ago ...

I just think the 'MTF' of camera shake induced blur is not quite as smooth as that of lenses (while not being quite as abrupt of that of discrete sampling). Combining two non-smooth MTFs will result in a fairly non-smooth system MTF.

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